def main():
    y_or_n = input('是否退出程序（y/n)')
    while y_or_n != 'y':
        gender = input('输入性别：')
        weight = float(input('体重kg'))
        height = float(input('身高cm'))
        age = int(input('年龄'))
        if gender == '男':
            bmr = 13.7 * weight + 5.0 * height - 6.8 * age + 66
        elif gender == '女':
            bmr = 9.6 * weight + 1.8 * height - 4.7 * age + 655
        else:
            bmr = -1
        if bmr != -1:
            print('基础代谢率：', bmr)
        else:
            print('性别填写有误')
        print()
        y_or_n = input('是否退出程序（y/n)')
if __name__ == "__main__":
    main()
